Muffler



L. L. HAAS June 3, 1941.

MUFFLER Filed Aug. 31, 1939 2 Sheets-Sheet 1 INVENTOE ATTOF/VEY June 3, 1941.

L. l. HAAS 2,244,393

MUFFLER Filed Aug. 31, 1939 2 Sheets-Sheet 2 fly. 3. 6

ATTGE/VEV.

or unitwill remain Patented June 3, 1941 UNITED STATES PATENT OFFICE m3 Lucien L. Haas, Ylillltnwn, aligns: to Mange companywne Youngs- MIII, 0

Application sum :1. 1m, Serial u. mass 6 Claim. (Cl. Ill-81) This invention relates to improvements in mufflers or silencers of the kind commonly employed for reducing the noise of the exhaust of internal combustion engines.

It is known that mufliers of various kinds as heretofore commonly employed become less effective in silencing sounds, if dirt, soot, or the like accumulates in the muffler and obstructs some of the openings or passages therein. Such accumulation of carbon deposits is, for example.

quite pronounced in the case with muillers used on Diesel engines, in which the exhaust contains considerable quantities of soot or unburnt car- One of the objects of this invention is to provide a muiiier of improved construction, which can readily be taken apart to render the interior thereof. accessible for cleaning and inspection. Another object of this invention is to provide a muiler of-this kind which is so constructed that the parts of the muilier are secured together in roups or units, so that when the muflier is taken apart, the individual parts of each group assembled in their operative positions.

A further object is to provide a muiiier having a head which is constructed of two parts, one of which is secured to the outer housing of the muilier, and the other of which is detachably secured to the muilier to permit removal of the same to afford access to the interior of the mufiier. A further object is to provide a mufller of this kind in which an inner muiiier shell is secured to the removable part of the head for removing the inner shell from the muiller.

Other objects of this invention will appear from the following description and claims.

In the accompanying drawings:

Fig. l is a longitudinal central sectional view of a runner embodying this invention, showing the parts ofthe muiller in their assembled or operative relation to each other.

Pig. 2 is a fragmentary central sectional view of the same muilier with the two units thereof P ly separated.

Fig. 8 is a transverse sectional elevation thereof, on line 8-3, Fig. 1, and on an enlarged scale.

Fig. 4 is a fragmentary transverse sectional elevation of an interlocking arrangement for the two parts or units of the muiiler, the parts being shown in their unlocked positions.

Pig. 5 is a fragmentary sectional plan view of the interlocking portion of the mufller.

Figs. 6 and 7 are respectively fragmentary sectionstakenonlinest-land l-|,1"ig. 5.

My invention is shown in the accompanying drawings as applied to a specific type of muiller constructed and operating upon the general principles of the muillers illustrated in the Starkweather and Haas Patent No. 2,047,442. It will be understood, however, that it is not intended to limit this invention to the particular type of muiiler shown, since this invention may be used in connection with muillers of many different types.

In the particular construction shown in the drawings, It represents the outer shell of the muilier and II an interior or inner shell arranged within the outer shell. The interior shell is provided with a plurality of groups of perforations or apertures II which may be of any suitable or desired shape or form. In the construction shown, the interior shell is also provided with restricting members It and I5 arranged between groups of perforations, and the muiller also has a baille l6 connecting the interior and outer shells and dividing the space between these shells into two sound deadening chambers. The baille It in the construction shown is welded or otherwise rigidly secured at its outer periphery to the inner face of the outer shell It and forms a support for an intermediate portion of the interior shell, this shell shown being provided with an annular outwardly extending bead or ridge H which slidably engages with an inner flange it of the baffle II when the interior shell is in its operative position.

In order to make it possible to conveniently remove the interior shell lengthwise from the muffler, I provide one of the heads of the muiiier with an inner part removably secured to an outer or peripheral part of the head, the inner part of the head being of such size that when removed from the outer part, it uncovers an opening in the head of sufllclent size to permit the interior shell or conduit to be moved lengthwise through the same. In the particular construction shown,. the inlet head of the muiler is provided with an outer or peripheral part 20 which is welded or otherwise rigidly secured to the outer shell II. The head also includes an inner part 2| which may be removably secured to the outer part 20 of the head in any suitable manner. The inner part of the head may be provided with the usual tubular slitted connecting portion 12 to which the exhaust pipe of an engine (not shown) may be connected in any suitable or usual manner.

The parts of my improved muilier are assembled in two imlts which are separable from each other. One of these units comprises the outer shell, one of the heads of the mui'iier and the outer or peripheral part of the other head, together with any additional parts that may be secured to this unit, as for example the bafiie IS. The other unit comprises the interior shell, with any parts that may be mounted thereon, together with the inner part of the other mufiier head. Interfitting connections are provided on the two units which hold the units in their operative positions relatively to each other when assembled, and any suitable interlocking connection may be provided for holding the two units in assembled relation, for example, the two head parts 20 and 2| may be provided with an interlocking connection for this purpose, which may; for example, be constructed as follows:

The outer part 20 of the head is of annular form and is provided at its inner portion with a tubular projection 24, and the inner part 2| of the head is provided with a corresponding tubular portion which may telescopically engage with the tubular projection 24. Any suitable means may be employed for securely but releasably connecting these telescoping portions of the two parts of the head, and in the construction shown for this purpose, the tubular portion 25 of the inner part of the head is provided with one or more longitudinal slits, two relatively narrow slits 21 being shown in the construction illustrated, see particularly Fig. 3 and a relatively wide slit 28. The tubular projection 24 of the outer part 20 of the head is provided on its outer surface with a suitable knob or projection and the tubular portion 25 of the other part of the head is provided at a side of the larger slit 28 with a notch or recess 3| which is so formed as to receive the knob or projection 30. It will be obvious that when the inner part of the head is moved into a telescoping engagement with the outer part, the tubular portion 25 of the inner part of the head is so positioned relatively to the cooperating tubular projection 24 that the knob or projection 30 may pass into the slit 28, and upon turning the, inner part 2| of the head to a slight extent, the knob 3|! will pass into the recess 3|, as shown in Figs. 3, 5, 6 and 7, so that endwise movement of the two parts of the head is prevented.

Suitable means are also provided for releasably clamping the two telescoping parts of the head together. In the construction shown for this purpose, a clamping band is provided for this purpose, the ends of which may be drawn together by means of a bolt 35 and a nut 31 passing through suitable apertures in the outwardly turned ends of the clamping band 35. These ends are preferably spaced apart sufflciently to permit the recess 3| to be positioned between the ends of the clamping band. Any other means for releasably securing the two parts of the head together may be employed.

The inner part 2| of the head of the muilier is provided with means for supporting one end of the interior shell H of the muffler. In the particular construction shown for this purpose, a substantially frusto-conical connecting sleeve is provided, one end of which may be welded or otherwise secured to the inner part 2| of the head, for example, to the split tubular portion 25. The inner end of the supporting sleeve 40 may support the adjacent end of the interior conduit in any suitable or desired manner, and if desired, this end of the interior shell may be welded or otherwise rigidly secured to the supporting sleeve 40, for example, as indicated at 4|.

The other or discharge head of the muiiier may be of any suitable or desired construction, and as illustrated, the discharge head is similar in construction to the intake head which has already been described. The discharge head also includes an outer or peripheral part 20 secured to the outer shell l0 and an inner part 2|, that shown being releasably secured to the outer part 20, by means of a clamp band 35 cooperating with telescoping tubular parts 24 and 25. The inner part 2| of this muilier head has a slitted tubular part 43 to which the usual tail pipe (not shown) may be secured.

The discharge head of the muffler is provided with a substantially frusto-conical connecting sleeve 45 which is secured to the inner part 2| of this muiller head, and which is provided at its inner end with a substantially cylindrical flange 46 preferably terminating at its inner end in an outwardly flaring portion or bell-mouth 41. This flange 46 is so formed as to provide a sliding support for the adjacent end of the interior conduit or shell When it is desired to remove the interior shell from the muiiier, the clamp band 35 is loosened or removed from engagement with the slitted tubular portion 25 of the inner part of the intake head of the muilier. The inner part of this head can then be turned so that the knob or projection 30 lies in the slit 28, whereupon this part of the head can be removed lengthwise from the other part 20 of the head. If the interior conduit ll of the mufller is secured to the sleeve 40, then the interior shell will be moved outwardly with the inner part of the head as indicated in Fig. 2. If the welding indicated at 4| is omitted. then the interior shell may be removed from the mufller separately from the inner head part 20. The interior shell, as well as the interior of the outer shell, may then be cleaned and can be replaced into the outer shell, the bell-mouth portion 41 helping to guide the adjacent end of the interior shell into operative relation to the supporting sleeve 45. The sliding connection of the interior shell with the baflie l5 and the sleeve 46 also has the advantage that the interior shell may expand and contract independently of the outer shell.

The construction described has the advantage that if the interior shell II is welded or otherwise secured to the inner part 2| of one of the heads of the muilier, the several parts of the muiiier, with the exception of the clamp band 35 are all assembled into two units, so that the muffler can be easily taken apart and put together again. Furthermore, the muffler constructed as described has approximately the same resistance to damage by internal explosions as mufliers as heretofore made, since the pressures due to ex plosions are resisted mainly by the outer shell of the muiiier and the outer parts 20 of the heads, which are rigidly secured to the outer shell as has heretofore been customary. Very little of the pressure resulting from the internal explosion will act on the removable inner parts 2| of the heads.

I claim as my invention:

1. A muffler including a pair of shells arranged one within another, heads permanently secured to the opposite ends of the outer of said shells, one of said heads having an opening therein of larger diameter than the interior shell, an inner head part having one end of the interior shell secured thereto, means for removably securing characterized in that said 2,244,sos

said inner head part to said last mentioned head about the opening therein, when said interior shell is positioned within said outer shell, and means fixed in said muiiier for slidably supporting said interior shell adjacent to the other end thereof, whereby when said inner head part is detached from its head, it may be removed with said interior shell from said muilier.

2. A muflier in accordance with claim 1, head with the opening therein and said inner head part have telescopic portions for releasably securing said parts of said head together.

3. A muiiier in accordance with claim 1, characterized in that the slidable supporting means for the other end of the interior shell is secured to the other head of the muiller.

4. A muiiier including a pair of shells arranged one within another, heads permanently secured to the opposite ends of the outer of said shells, one of said heads having an opening therein of larger diameter than the interior shell, an inner head part having one end of the interior shell secured thereto, telescoping tubular parts formed on said head about the opening therein and on said inner head part, a projection on one of said telescopic parts adapted to extend into a recessintheothertelescoping part,andaclamping band for securing said telescopic parts in operative relationtoeachotherandtorpreventingsaid proiectiontrom moving out oi! engagement with saidreceas.

5. A muiller having the parts thereof secured toeitheroi'twounitswhichareseparablenom permit the interior shell to each other, one 01' said units comprising a muilier shell, and heads permanently secured to the opposite ends thereof, the other unit comprising an interior muiiier shell and an inner head part secured to one end thereof, one 01 said heads having an opening therein of sufficient size to permit the interior shell to be inserted into and removed from the muilier lengthwise therethrough, and cooperating parts on said head and said inner head part for releasably securing said units in their operative positions with said interior shell arranged within said outer shell, and means on said first unit for releasably supporting the other end of the interior shell.

6. A muiiier having the parts thereof secured to either of two units which are separable from each other, one of said units comprising a muilier shell, and heads permanently secured to the opposite ends thereof, the other unit comprising an interior muiiler shell and an inner head part secured to one end thereof, one of said heads having an opening therein of sufllcient size to be inserted into and removed from the v muiiler lengthwise therethrough, and cooperating parts on said head and said inner head part for releasably securing said units in their operative positions with said interior shell arranged within said outer shell, said first muilier unit being provided in the interior thereof with a bell-mouthed supporting device for said interior shell, whereby said interior shell may be readily inserted in its operative position in the mufler.

LUCIEN L. HAAS. 

